So! here is the more... I fimally found what I think I was looking for related to the engine. this is what I decided on:
2013 4.8 LS motor and transmission. it is a "drop out" package so it includes everything from the front acc. to the transmission also all the harnesses and emission stuff.
I know it is not the 5.3, but I am looking for this to be a daily driver & to be honest I was not finding this same package with a 5.3 AND it only has 57,466 miles on it. all others I saw were not as complete and had many more miles on them.